DeepSeek V4.1 Flash hands-on tests and comparisons

The author suggests letting smarter Kimi K3.1 Pro do the reasoning while fast, cheap V4.1 Flash 1017 handles output, asking how hard that split would be.

A 367-task eval of official V4.1 Flash 1017 against a local GSQ-RCO IQ2_XS quant found both passing everything, with the full-weight model scoring marginally lower than the quantized one.

The model card lists Terminal-Bench 4.0 rising from 31.2 on the previous Flash to 42.3, plus deepseek-recipe Rust libraries with Python bindings.

The author released a Maya-S GGUF quant built on DeepSeek-V4.1-Flash-1017, running about 20 tok/s on an RTX 5090 with quality they call impressive.

A home rig with two RTX 3090s and 256GB DDR4 runs DeepSeek V4.1 Flash at EXL3 ~3bpw, hitting 26–32 tok/s decode and 737–830 tok/s prefill, with a 100k prompt in about 2 minutes.

A translated Devsplainers video walkthrough: V4.1 Flash logged 4.5M sessions the day after opening free on OpenCode; covers picking free-tier models, disabling auto-recharge, the 200K context cap, and keeping confidential code out.

The author is porting TensorFold to dual Ampere A6000s in TP=2, keeping experts on the GPUs and other weights on a DGX Spark, with 384GB RAM and 96GB VRAM and about 75% of the code done.

On Coding Agent Index v2.0, Codex + DeepSeek V4.1 Flash scores 47.3 at $0.39 per task versus 61.7 at $11.42 for Claude Code + Opus 5.5 — about 29x the cost for +14.4 points.

A post contrasts Opus 5.5's $20 per million output tokens with DeepSeek V4.1 Flash's $1.20 and asks which one a startup would run on.

The poster says K3.1 Pro beats K3 but is far from Opus 5.5 in real work, and that cheaper DeepSeek V4.1 Flash still wins on real coding, calling the launch oversold.

The author recommends Flash (~$0.42/task, 57%, top open-source on Cyber) for repeated scanning and routine bug fixes, reserving GPT-6 Sol (~$1.77/task) for stricter attack-defense work where refusals matter.

OpenCode Go's $10/month plan shares a 60-coefficient pool; DeepSeek V4.1 Flash costs 0.75 per $1 (about $80 of usage) while Kimi K3.1 Pro costs 4 per $1.